The bin is the movie. Its a big ol pile of 1's and 0's that when used in a cd burning program like CDRWin, comes out as a CD matching the origional from which the bin was made.
The cue points the burner to the bin. So say your bin is on c:/windows/desktop/pooptaco. The cue might read c:/movies/new or something. Just open up the cue in textpad, and point it to where the bin file is stored.
Pretty stupid system if you ask me, but ya gotta do what cha gotta do.